Accelerating the peroxidase-like activity of MoSe 2 nanosheets at physiological pH by dextran modification

References

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723Accelerating the peroxidase-like activity of MoSe 2 nanosheets at physiological pH by dextran modificationhttps://doi.org/10.1039/D0CC03980BCompositeThe multivalent hydrogen bonding of dextran can react with bulk MoSe2 during ultrasound exfoliation, which effectively produces MoSe2 nanosheets (dex-MoSe2 NS)

Materials

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723dex-MoSe2 NSAFM measurement was carried out to confirm the ultrathin structure of dex-MoSe2 (Fig. S1, ESI†). The height of (1–3) nm indicates that the thickness of MoSe2 is nearly one to two single layers (Fig. S1B, ESI†). The TEM images and SAED pattern of dex-MoSe2 in Fig. S2 (ESI†) reveal that the dex-MoSe2 NSs retain a lattice spacing of (0.280 ± 0.005, n = 3) nm, which matches the d-spacing of the (100) plane of 2H-MoSe2, indicating that the inherent 2H phase is still retained after exfoliation and functionalization in the dextran solution.20 The dex-MoSe2 was measured by dynamic light scattering (DLS, Fig. 1B and Fig. S3, ESI†) which shows that the average hydrodynamic size was about (62.8 ± 1.4, n = 3) nm and the zeta potential was −23.70 mV in water.

Kinetics

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Applications

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723dex-MoSe2 NSdetection of glucoseglucoseColor0.04-0.40mM0.028mM97.2%-106.1%